# US 10,371,794 B2 · Unmanned aerial vehicle with deployable transmit/receive module apparatus with ramjet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,794 B2 - Document ID: US10371794B2 - Status: Granted - Kind: B2 - Application number: 15/165,663 - Filed: 2016-05-26 - Published: 2017-11-30 - Granted: 2019-08-06 - Earliest claimed: 2016-05-26 - Assignees: The Boeing Company - Applicants: The Boeing Company - Inventors: Inyoung Daniel Kim; Ryan S. Wilson - Web page: https://patentgrep.com/patent/US10371794B2 ## CPC - G01S 7/021: {Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals} - B64C 3/38: Adjustment of complete wings or parts thereof - B64C 9/326: {associated with fuselages} - B64C 30/00: Supersonic type aircraft - B64D 5/00: Aircraft transported by aircraft, e.g. for release or reberthing during flight - B64D 7/00: Arrangement of military equipment, e.g. armaments, armament accessories or military shielding, in aircraft; Adaptations of armament mountings for aircraft (dropping bombs or the like B64D1/00) - B64D 47/02: Arrangements or adaptations of signal or lighting devices - B64U 50/15: using combustion exhausts other than turbojets or turbofans, e.g. using rockets, ramjets, scramjets or pulse-reactors - F02K 7/10: characterised by having ram-action compression, i.e. aero-thermo-dynamic-ducts or ram-jet engines - F42B 10/48: Range-reducing, destabilising or braking arrangements, {e.g. impact-braking arrangements}; Fall-retarding means, {e.g. balloons, rockets for braking or fall-retarding}(F42B10/34 takes precedence) - G01S 7/003: {Transmission of data between radar, sonar or lidar systems and remote stations} - G01S 13/003: {Bistatic radar systems; Multistatic radar systems} - G01S 13/87: Combinations of radar systems, e.g. primary radar and secondary radar - G05D 1/00: Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots (drive control systems specially adapted for autonomous road vehicles B60W60/00) - G05D 1/0011: {associated with a remote control arrangement} - H01Q 1/287: {integrated in a wing or a stabiliser} - B64U 70/20: for releasing or capturing UAVs in flight by another aircraft - B64U 2101/20: for use as communications relays, e.g. high-altitude platforms - F05D 2220/10: in ram-jet engines or ram-jet driven vehicles - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - B64C: AEROPLANES; HELICOPTERS - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - B64U: UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR - F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00) - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A system for bistatic radar target detection employs an unmanned aerial vehicle (UAV) having a ramjet providing supersonic cruise of the UAV. Deployable antenna arms support a passive radar receiver for bistatic reception of reflected radar pulses. The UAV operates with a UAV flight profile in airspace beyond a radar range limit. The deployable antenna arms have a first retracted position for supersonic cruise and are adapted for deployment to a second extended position acting as an airbrake and providing boresight alignment of the radar receiver. A mothership aircraft has a radar transmitter for transmitting radar pulses and operates with an aircraft flight profile outside the radar range limit. A communications data link operably interconnects the UAV and the tactical mothership aircraft, transmitting data produced by the bistatic reception of reflected radar pulses in the UAV radar antenna to the mothership aircraft. ## Claims ### Claim 1 A system for bistatic radar target detection comprising: a mothership aircraft having a radar transmitter for transmitting radar pulses, said mothership aircraft operating with an aircraft flight profile outside a radar range limit with respect to a target; an unmanned aerial vehicle (UAV) having a ramjet providing supersonic cruise of the UAV, and deployable antenna arms supporting a passive radar antenna having a plurality of receive (Rx) modules for bistatic reception of reflected radar pulses, said UAV operating with a UAV flight profile in airspace beyond the radar range limit relative to the target, said deployable antenna arms having a first retracted position for supersonic cruise and adapted for deployment to a second extended position, said second extended position acting as an airbrake and providing boresight alignment of the Rx modules; and, a communications data link operably interconnecting the UAV and the tactical mothership aircraft, said communications data link transmitting data produced by the bistatic reception of reflected radar pulses in the UAV radar antenna to the mothership aircraft. ### Claim 2 (depends on 1) The system for bistatic radar target detection as defined in claim 1 further comprising a UAV controller in the mothership aircraft, said UAV controller operably connected to the communications data link and transmitting flight control information to a UAV flight control system to control the UAV flight profile. ### Claim 3 (depends on 1) The system for bistatic radar target detection as defined in claim 1 wherein the antenna arms deployed to the second position maintain an extension angle not greater than the tilt angle of an inlet intake of the ramjet engine. ### Claim 4 (depends on 1) The system for bistatic radar target detection as defined in claim 1 wherein the passive radar receiver comprises a plurality of receive (Rx) modules attached to the antenna arms at an angle complimentary to the extension angle. ### Claim 5 (depends on 3) The system for bistatic radar target detection as defined in claim 3 wherein the antenna arms in the first retracted position are substantially flush with a side profile of the UAV. ### Claim 6 (depends on 4) The system for bistatic radar target detection as defined in claim 4 further comprising deployment rods pivotally connected to the antenna arms to deploy the antenna arms. ### Claim 7 (depends on 6) The system for bistatic radar target detection as defined in claim 6 wherein the deployment rods are carried in a pressure cylinder and activated by pneumatic pressure from a bypass duct connected to the inlet intake. ### Claim 8 (depends on 2) The system for bistatic radar target detection as defined in claim 2 further comprising a self-destruct system in the UAV. ### Claim 9 (depends on 6) The system for bistatic radar target detection as defined in claim 6 wherein the self-destruct system is operable by the UAV flight control system or the UAV controller. ### Claim 10 A method for bistatic radar target detection comprising: launching an unmanned aerial vehicle (UAV) having a ramjet providing supersonic cruise of the UAV and navigating the UAV with a UAV flight profile in airspace beyond a radar range limit relative to the target with the ramjet engine at supersonic cruise to beyond the radar range limit; maintaining a mothership aircraft having a radar transmitter for transmitting radar pulses, said mothership aircraft operating with an aircraft flight profile outside the radar range limit; extending deployable antenna arms supporting a passive radar antenna having a plurality of receive (Rx) modules for bistatic reception of reflected radar pulses and having a first retracted position for supersonic cruise and adapted for deployment to a second extended position, said second extended position acting as an airbrake and providing boresight alignment of the Rx modules to the second position to act as air brakes reducing speed and providing boresight orientation of Tx/Rx modules for bistatic RF pulse reception; employing a radar transmitter on the mothership aircraft to transmit radar pulses; employing the receive (Rx) modules on the UAV as a bistatic receiver to receive reflected radar pulses from targets; and, transmitting target data from the UAV to the mothership aircraft via a communications data link operably interconnecting the UAV and the tactical mothership aircraft, said communications data link transmitting data produced by the bistatic reception of reflected radar pulses in the UAV passive radar antenna to the mothership aircraft. ### Claim 11 (depends on 10) The method as defined in claim 10 further comprising: mounting the UAV to the mothership aircraft; and, the step of launching the UAV comprises launching the UAV from the mothership aircraft. ### Claim 12 (depends on 11) The method as defined in claim 11 further comprising: downloading mission information from the mothership aircraft to the UAV. ### Claim 13 (depends on 12) The method as defined in claim 12 wherein the mission information includes a flight profile for the UAV. ### Claim 14 (depends on 11) The method as defined in claim 11 further comprising: receiving flight control information to the UAV from the mothership aircraft over the communications data link. ### Claim 15 (depends on 11) The method as defined in claim 11 further comprising: reporting location and current status by the UAV over the communications data link. ### Claim 16 (depends on 10) The method as defined in claim 10 further comprising: retracting the antenna arms and flying the UAV at supersonic cruise to uncontested airspace upon completion of the mission profile; and, recovering the UAV through soft landing or other known recovery techniques. ### Claim 17 (depends on 10) The method as defined in claim 10 further comprising: causing the UAV to self-destruct after completion of a mission profile. ### Claim 18 (depends on 17) The method as defined in claim 17 wherein the step of causing the UAV to self-destruct is autonomous through commands from the UAV control system. ### Claim 19 (depends on 17) The method as defined in claim 17 wherein the step of causing the UAV to self-destruct occurs upon direction from the UAV controller on the mothership aircraft. ### Claim 20 An unmanned aerial vehicle (UAV) comprising: a ramjet providing supersonic cruise of the UAV, and deployable antenna arms supporting a passive radar antenna having a plurality of receiver (Rx) modules for bistatic reception of reflected radar pulses from a radar transmitter on a mothership aircraft, said mothership aircraft operating with a flight profile outside a radar range limit and said UAV operating with a UAV flight profile in airspace beyond the radar range limit, said deployable antenna arms having a first retracted position for supersonic cruise and adapted for deployment to a second extended position, said second extended position acting as an airbrake and providing boresight alignment of the Rx modules; and, a communications data link operably interconnecting the UAV and the mothership aircraft, said communications data link transmitting data produced by the bistatic reception of reflected radar pulses in the UAV radar antenna to the mothership aircraft.